Civil Defense Administration has decided to locate the strategic supply of tapioca using the center$-$of$-$gravity criterion. The tapioca centers of the United States are indicated in the following table, along with their location and annual tonnage. What is the x$-$y coordinate of the underground tapioca bunker that should be constructed?

City	New York	Miami	Fargo	McAllen	Portland	San Diego
x $-$coordinate	$13$	$12$	$8$	$8$	$1$	$3$
y $-$coordinate	$6$	$1$	7	$1$	$6$	2
Volume	$9,000$	$8,000$	$10,000$	$2,000$	$9,000$	$4,000$

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